How the mechanism works<\/h2>\n
As the cam contacts the roller, the plunger moves toward the switch body. The internal mechanism changes state at the operating point and returns after the cam retreats past the release point. The difference creates useful hysteresis. The roller bearing, plunger guide, seals, return spring, and internal contacts all contribute to behavior. A cam that drives too deeply or hits from the side can damage the mechanism even when the electrical circuit is correct.<\/p>\n This table is intentionally qualitative. Numerical limits, ratings, torque, force, travel, environmental claims, and endurance values must be taken from the current datasheet and evaluated under the application conditions.<\/p>\n What to verify:<\/strong> Use a smooth lead-in and lead-out compatible with the switch drawing. Sharp edges create impact and unstable motion. The requirement should be written in the project specification and traced to the exact model drawing or datasheet. Review worst-case tolerance, wear, contamination, maintenance access, and foreseeable misuse. If the available documentation does not define the boundary, keep the point open for supplier confirmation and sample testing rather than substituting an assumption.<\/p>\n What to verify:<\/strong> Keep the resulting force close to the permitted plunger axis. Side force can bind the guide or accelerate wear. The requirement should be written in the project specification and traced to the exact model drawing or datasheet. Review worst-case tolerance, wear, contamination, maintenance access, and foreseeable misuse. If the available documentation does not define the boundary, keep the point open for supplier confirmation and sample testing rather than substituting an assumption.<\/p>\n What to verify:<\/strong> Cross the operating point under every tolerance condition. Too little stroke causes missed signals. The requirement should be written in the project specification and traced to the exact model drawing or datasheet. Review worst-case tolerance, wear, contamination, maintenance access, and foreseeable misuse. If the available documentation does not define the boundary, keep the point open for supplier confirmation and sample testing rather than substituting an assumption.<\/p>\n What to verify:<\/strong> Provide margin without reaching the mechanical limit. Controlled overtravel absorbs variation without using the switch as a stop. The requirement should be written in the project specification and traced to the exact model drawing or datasheet. Review worst-case tolerance, wear, contamination, maintenance access, and foreseeable misuse. If the available documentation does not define the boundary, keep the point open for supplier confirmation and sample testing rather than substituting an assumption.<\/p>\n What to verify:<\/strong> Compare minimum and maximum cam speed with the device limits. Very slow or fast motion can change switching behavior and impact. The requirement should be written in the project specification and traced to the exact model drawing or datasheet. Review worst-case tolerance, wear, contamination, maintenance access, and foreseeable misuse. If the available documentation does not define the boundary, keep the point open for supplier confirmation and sample testing rather than substituting an assumption.<\/p>\n What to verify:<\/strong> Match the roller and cam surfaces to wear and contamination conditions. A roller is still a mechanical contact interface. The requirement should be written in the project specification and traced to the exact model drawing or datasheet. Review worst-case tolerance, wear, contamination, maintenance access, and foreseeable misuse. If the available documentation does not define the boundary, keep the point open for supplier confirmation and sample testing rather than substituting an assumption.<\/p>\n What to verify:<\/strong> Prevent bracket movement and fastener loosening. Small mounting shifts change the operating point. The requirement should be written in the project specification and traced to the exact model drawing or datasheet. Review worst-case tolerance, wear, contamination, maintenance access, and foreseeable misuse. If the available documentation does not define the boundary, keep the point open for supplier confirmation and sample testing rather than substituting an assumption.<\/p>\n What to verify:<\/strong> Check ingress, temperature, oil, chips, vibration, and cable sealing. Protection must apply to the complete installed assembly. The requirement should be written in the project specification and traced to the exact model drawing or datasheet. Review worst-case tolerance, wear, contamination, maintenance access, and foreseeable misuse. If the available documentation does not define the boundary, keep the point open for supplier confirmation and sample testing rather than substituting an assumption.<\/p>\n For every application, include startup, normal operation, shutdown, loss of power, restoration of power, maintenance mode, component replacement, and the faults identified by the risk assessment. A general control switch should not be treated as a complete safety function.<\/p>\n Provide the application, target market, applicable standards, machine function, supply and load, control interface, contact logic, mechanical drawing, motion path, panel dimensions, cable method, environment, operating frequency, quantity, documentation needs, and sample-validation plan. Ask the supplier to identify assumptions and exceptions. ONPOW offers relevant products in its application-specific product family<\/a> and the broader industrial control product range<\/a>.<\/p>\n![\"Compact](\"https:\/\/onpowbutton.com\/wp-content\/themes\/onpow\/assets\/images\/ltm-1704-2-product__1704.png\" "\\"Compact")
Selection criteria at a glance<\/h2>\n
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\n \nDecision area<\/th>\n What to verify<\/th>\n Engineering reason<\/th>\n<\/tr>\n<\/thead>\n \n Cam profile<\/strong><\/td>\n Use a smooth lead-in and lead-out compatible with the switch drawing<\/td>\n Sharp edges create impact and unstable motion.<\/td>\n<\/tr>\n \n Approach direction<\/strong><\/td>\n Keep the resulting force close to the permitted plunger axis<\/td>\n Side force can bind the guide or accelerate wear.<\/td>\n<\/tr>\n \n Operating travel<\/strong><\/td>\n Cross the operating point under every tolerance condition<\/td>\n Too little stroke causes missed signals.<\/td>\n<\/tr>\n \n Overtravel<\/strong><\/td>\n Provide margin without reaching the mechanical limit<\/td>\n Controlled overtravel absorbs variation without using the switch as a stop.<\/td>\n<\/tr>\n \n Speed<\/strong><\/td>\n Compare minimum and maximum cam speed with the device limits<\/td>\n Very slow or fast motion can change switching behavior and impact.<\/td>\n<\/tr>\n \n Roller material<\/strong><\/td>\n Match the roller and cam surfaces to wear and contamination conditions<\/td>\n A roller is still a mechanical contact interface.<\/td>\n<\/tr>\n \n Mounting rigidity<\/strong><\/td>\n Prevent bracket movement and fastener loosening<\/td>\n Small mounting shifts change the operating point.<\/td>\n<\/tr>\n \n Environment<\/strong><\/td>\n Check ingress, temperature, oil, chips, vibration, and cable sealing<\/td>\n Protection must apply to the complete installed assembly.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n Detailed selection process<\/h2>\n
Cam profile<\/h3>\n
Approach direction<\/h3>\n
Operating travel<\/h3>\n
Overtravel<\/h3>\n
Speed<\/h3>\n
Roller material<\/h3>\n
Mounting rigidity<\/h3>\n
Environment<\/h3>\n
![\"ONPOW](\"https:\/\/onpowbutton.com\/wp-content\/themes\/onpow\/assets\/images\/ltm-1701-2-product__1701.png\" "\\"ONPOW")
Application review<\/h2>\n
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Commissioning checklist<\/h2>\n
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Common mistakes<\/h2>\n
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What to include in an RFQ<\/h2>\n
Related ONPOW guides<\/h2>\n